<template>
  <view>
    <view class="search-box">
      <uni-search-bar @input="input" :radius="100" cancelButton="none"></uni-search-bar>
    </view>
    
    <!-- 搜素建议列表 -->
    <view class="sugg-list"  v-if="searchResult.length !== 0">
      <view class="sugg-item" v-for="(item, i) in searchResult" :key="i" @click="gotoDetail(item)">
        <view class="goods-name">
          {{item.goods_name}}
        </view>
        <uni-icons type="forward" size="16"></uni-icons>
      </view>
    </view>
    
    <!-- 搜素历史 -->
    <view class="history-box" v-else>
      <!-- 标题区域 -->
      <view class="history-title">
        <text>搜素历史</text>
        <uni-icons type="trash-filled" size="18" @click="clean"></uni-icons>
      </view>
      <!--列表区域 -->
      <view class="history-list">
        <uni-tag :text="item " v-for="(item, i) in histories" :key="i" @click="gotoGoodsList(item)"></uni-tag>
      </view>
    </view>
  </view>
</template>

<script>
  export default {
    data() {
      return {
        timer: null,
        kw: '',
        // 搜素结果列表
        searchResult: [],
        // 搜素历史列表
        historyList: ['a','app']
      };
    },
    onLoad() {
      this.historyList = JSON.parse(uni.getStorageSync('kw') || '[]')
    },
    methods: {
      // input事件处理函数
      input(e) {
        //清除timer对应的延时器
        clearTimeout(this.timer)
        //重新启动一个延时器，并把timerId赋值给this.timer
        this.timer = setTimeout(()=>{
          this.kw= e
          this.getSearchResult()
        },500)
      },
      async getSearchResult(){
        // 判断搜素关键字是否为空
        if(this.kw === ''){
          this.searchResult= []
          return
        }
        // 发起网络请求，获取搜素列表
        const {data: res} = await uni.$http.get('/api/public/v1/goods/search', {query: this.kw})
        if(res.meta.status !== 200) return uni.$showMsg()
        
        this.searchResult = res.message.goods
        
        this.saveSearchList()
      },
      gotoDetail(item) {
        console.log(item.goods_id)
        uni.navigateTo({
          url:'/subpkg/goods_detail/goods_detail?goods_id=' + item.goods_id
        })
      },
      saveSearchList(){
        // this.historyList.push(this.kw)
       const set =  new Set(this.historyList)
       set.delete(this.kw)
       set.add(this.kw)
       this.historyList = Array.from(set)
       
       // 调用 uni.setStorageSync(key,value) 将历史数据持久化
       uni.setStorageSync('kw',JSON.stringify(this.historyList))
      },
      clean() {
        this.historyList = []
        uni.setStorageSync('kw','[]')
      } ,
      gotoGoodsList(kw) {
        uni.navigateTo({
          url: '/subpkg/goods_list/goods_list?query=' + kw
        })
      }
    },
    computed: {
      histories(){
       return [...this.historyList].reverse()
      }
    }
  }
</script>

<style lang="scss">
  .search-box {
    position: sticky;
    top: 0;
    z-index: 999;
  }
  
  .sugg-list {
    padding: 0 5px;
    
    .sugg-item {
      display: flex;
      font-size: 12px;
      align-items: center;
      justify-content: space-between;
      border-bottom: 1px  solid #efefef;
      padding: 13px 0;
      
      .goods-name {
        white-space: nowrap;
        overflow: hidden;
        text-overflow: ellipsis;
        margin-right: 3px;
      }
    }
  }
  
  .history-box {
    padding: 0 5px;
    
    .history-title {
      display: flex;
      justify-content: space-between;
      font-size: 13px;
      height: 40px;
      align-items: center;
      border-bottom: 1px solid #efefef;
    }
    
    .history-list {
      display: flex;
      flex-wrap: wrap;
      
      .uni-tag {
        margin-top: 5px;
        margin-right: 5px;
      }
    }
  }
</style>
